She is a female kangaroo moth hybrid that was created by dr. Amino. She appears in Ben 10: The letter K.
history:
K was created by dr. Amino and soon she fights Ben as Crashhopper but she reforms and joins ben’s side. She reappears in happy britches Ben Tennyson as a cameo with the other characters as well. She also appeared in fractured fairy tales and also as Snow White, Cinderella. And many others.
phsycial apperance:
K is a female kangaroo with moth eyes and she is small as a Galvan.
power and abilities:
K can jump very high like Crashhopper and also she can be very springy at all.
weaknesses:
she is prone to malware’s goop like so. Just a mutant galvanic Mechamorph.
trivia:
K is voiced by Kathleen Barr.
K is for kangaroo in English and French.
Is it unknown if K is from France.
she also did the voice of nelly from tom and Jerry: a nutcracker tale.
she parodied the Snow White story in one episode.

Full look.